[en] Demonstration and Demonstrator of MSFR: - Sizing of the facilities: Small size: ~1liter - chemistry and corrosion – off-line processing; Pyrochemistry: basic chemical data, processing, monitoring. Medium size: ~100 liters – hydrodynamics, noble FP extraction, heat exchanges; Process analysis, modeling, technology tests. Full size experiment: ~1 m3 salt / loop – validation at loop scale Validation of technology integration and hydrodynamics models. - 3 levels of radio protection: → Inactive simulant salt ⇒ Standard laboratory; Hydrodynamics, material, measurements, model validation; → Low activity level (Th, depleted U) ⇒ Standard lab + radio protect; Pyrochemistry, corrosion, chemical monitoring. → High activity level (^enrichedU, ²³³U, Pu, MA) ⇒ Nuclear facility; Fuel salt processing: Pyrochemistry, Actinides recycling